That’s a good question. I’m guessing there’s a fair degree of food imports (mostly from Reach, Riverlands) – the Westerlands are pretty hilly, which tends to mean less arable in terms of grains and vegetables (Westerlands seems to tend more towards cattle-herding). Wines, definitely, both from Dorne and the Reach. Wool and probably timber from the North, tin from the Isles, linen or flax from the Reach, Dornish silks and citrus fruits and olive oil.
Lots of luxury goods from Essos, I imagine – chiefly textiles (lace, tapestries, carpets, fine woolens), but also perfumes, dyes, spices, advanced manufactures from Myr, furs from Qohor (I’m guessing there’s a heavy tariff on steel to protect strategically important industry), hard alcohol, glassware, etc.
Ok, slight rethink. So, yeah, the southern Westerlands especially are fairly fertile.
However…given that so much of the population isn’t working the fields and is working in mines or workshops instead, it may be a case where there aren’t enough laborers to intensively cultivate enough to feed the non-farming population, hence the need for imports.
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